Check the Ground
CHECK THE GROUND1. CHECK THE RESISTANCE BETWEEN TERMINALS.
1. Set the starter switch to "LOCK" and connect the signal check harness.
2. Disconnect the signal check harness connector on the ECU side.
3. Measure the resistance between PGD1(D1), PGD2(E4), PGD3(E5) and battery (-) terminals.
Standard: Less than 1 ohm